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MSP430FR2033 USCI时钟源选取

用户手册里UCSSELx位说明01b为device specific

但是在data sheet里也没有明确指出若UCSSELx = 01,时钟源对应的是哪个

eUSCI_B 时钟源选择。这些位选择BRCLK 时钟源。这些位在从模式中被忽略。
只在UCSWRST = 1 时修改。
00b = UCLKI
01b = 特定于器件
10b = SMCLK
11b = SMCLK